超临界流体金属微结构电铸的传质特性

Mass Transfer Characteristics of Supercritical Fluid Electroformed Metal Microstructure

根据超临界CO2流体电铸金属镍的微结构特征，建立深宽比结构的物质离子传质特性模型。利用Matlab软件对其进行求解，考察深宽比对NiOH＋，OH＋，H^＋，Ni^2＋和SO42-五种物质离子传质过程的影响规律。结果表明：在深宽比为4时，电铸实施过程中微结构自上而下，NiOH＋和OH的浓度分别增大3倍和15倍，H^＋的浓度为原来的3．75％，而Ni^2＋和SO42-的浓度仅减小0．005-0．05mol／L。这些参数可为高深宽比超临界单一金属电铸和复合电铸提供科学依据。

According to the microstructure characteristics of supercritical COz fluid electroformed nickel, a model of material mass transfer characteristics with depth-width ratio structure was established. By solving the problem with Matlab software, the effect law of depth width ratio on the transfer process of five ions of NiOH＋ , OH , H＋ , Ni2＋ and SO42 - was investigated. The results show that when depth-width ratio is 4, the microstructure is from top to bottom in the electroforming implementation process, the NiOH＋ and OH concentrations are increased by 3 and 15 times respectively, the concentration of H＋ is 3.75% of the original, while the concentrations of Ni2＋ and SO42- is decreased only by 0. 005-0.05 mol/L. These parameters can provide a scientific basis for high aspect ratio supercritical single metal and composite electroforming.